Welcome! Log In Create A New Profile

Mechanical end stop

TonyPagett

Mechanical end stop
February 15, 2017 12:03PM

Registered: 7 years ago
Posts: 9

I have four mechanical end stops with three wires each (red LED on activation) and have no problems with any of them.

However, I have a fifth end stop (limit switch with just two wires to pin and GND) and it keeps on playing up.

Sometimes I only have to touch the wires and the end stop activates.

Should there be a resistor tying the pin out to GND? or should this resistor be part of the RAMPS board?

Reply Quote

Srek

Re: Mechanical end stop
February 15, 2017 01:20PM

Registered: 12 years ago
Posts: 2,470

Usually this is handled by the internal pullup resistors the Arduino supports. This might need to be enabled in the Firmware.

[www.bonkers.de]
[merlin-hotend.de]
[www.hackerspace-ffm.de]

Reply Quote

TonyPagett

Re: Mechanical end stop
February 15, 2017 01:38PM

Registered: 7 years ago
Posts: 9

Thank you Srek I thought I had read about the pull up resistors.
I will scour the firmware later to see the settings for end stops

Reply Quote

stevenkw1

Re: Mechanical end stop
March 05, 2017 07:56PM

Registered: 7 years ago
Posts: 18

actually how many end stop do we need on the 3d printer? its 3 is enough? ( x , y ,z axis )

Reply Quote

Srek

Re: Mechanical end stop
March 06, 2017 01:53AM

Registered: 12 years ago
Posts: 2,470

In a cartesian printer one for each moving axis, so usually three. On my dual X printer i need four since it has independent printheads.

[www.bonkers.de]
[merlin-hotend.de]
[www.hackerspace-ffm.de]

Reply Quote

WarriorMe

Re: Mechanical end stop
June 08, 2017 09:16AM

Registered: 7 years ago
Posts: 8

2-wire endstops are usually a microswitch that opens when triggered, so the fact that it triggers when you touch your wires probably means that one of the wires or connectors is broken, so that the circuit opens when you move them slightly...

Reply Quote

dc42

Re: Mechanical end stop
June 09, 2017 07:25AM

Registered: 10 years ago
Posts: 14,672

Quote
stevenkw1
actually how many end stop do we need on the 3d printer? its 3 is enough? ( x , y ,z axis )

Many printers use the Z probe to home the Z axis, which reduces the number of endstop switches to 2. The Ormerod printer uses just one, because the IR sensor used as the Z probe is also used to do X homing.

Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].